What scan tool are you using? Here's what a Tech 2 or Tech2Win would show for that circuit on a 2010 Impala LZE (VIN K):

[2010 Chevrolet Impala LS, ECM/Inputs/Outputs Document]

I don't know for certain if you'd see similar PIDs on your 2007, or if you'd see... Login to read more.

Files Referenced: